Incompatiable with ethers@6.6.4

[nijynot]

I'm using ethers with version 6.6.4.

When calling

const { domain, types, values } = AllowanceTransfer.getPermitData(
  permit,
  permitAddress,
  chainId
);
return signer.signTypedData(domain, types, values);

I get the error

Argument of type 'import("/node_modules/@ethersproject/abstract-signer/lib/index").TypedDataDomain' is not assignable to parameter of type 'import("/node_modules/ethers/lib.esm/hash/typed-data", { assert: { "resolution-mode": "import" } }).TypedDataDomain'.
  Types of property 'chainId' are incompatible.
    Type 'BigNumberish | undefined' is not assignable to type 'BigNumberish | null | undefined'.
      Type 'BigNumber' is not assignable to type 'BigNumberish | null | undefined'.ts(2345)

I think this is due to ethers on permit2-sdk being ethers 5, and I'm using ethers 6.
Are there any plans to be compatible with ethers 6, or that's up to the user to do?